Hose – Fits Mercury/Mercruiser 4.3L, 5.0L, & 5.7L (Replaces Mercury/Mercruiser 32-871171)
Hose – Fits Mercury/Mercruiser 4.3L, 5.0L, & 5.7L (Replaces Mercury/Mercruiser 32-871171) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Hose – Fits Mercury/Mercruiser 4.3L, 5.0L, & 5.7L (Replaces Mer...
Product Details
This high-quality molded Hose – Fits Mercury/Mercruiser 4.3L, 5.0L, & 5.7L is designed for V6 and V8 engines (305 & 350 cid) from 1987 to 1996, typically found in MCM/MIE series stern drives and inboards.
It serves as a direct replacement for Mercury Marine 32-871171 and 32-87117, Mallory Marine 9-44059, and Sierra 18-70932.
- Installs between the thermostat cover and the starboard exhaust manifold.
- Features a 1 in. (25.4 mm) I.D. at one end and a 13/16 in. (20.64 mm) I.D. at the other.
- Engineered to meet or exceed OEM specifications for durability and fit.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury Marine | 32-871171 |
| Mercury Marine | 32-87117 |
| Mallory Marine | 9-44059 |
| Sierra | 18-70932 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury/Mercruiser engines, this hose fits a wide range of V6 and V8 models produced between 1987 and 1996.
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| Mercury/Mercruiser | 4.3L (Gen II) | 1993–1995 | 32-871171 | 2 BBL models |
| Mercury/Mercruiser | 4.3LX (Gen II) | 1993–1995 | 32-871171 | 4 BBL models |
| Mercury/Mercruiser | 5.0L (2 BBL) | 1988–1995 | 32-871171 | |
| Mercury/Mercruiser | 5.0LX (4 BBL) | 1988–1995 | 32-871171 | |
| Mercury/Mercruiser | 5.7L | 1988–1995 | 32-871171 | |
| Mercury/Mercruiser | 5.7L Competition Ski | 1987–1995 | 32-871171 | GM 350 V-8 |
| Mercury/Mercruiser | 5.7L MIE | 1994–1995 | 32-871171 | GM 350 V-8 |
| Mercury/Mercruiser | 200 (2 BBL) | 1987 | 32-871171 | GM 305 V-8 |
| Mercury/Mercruiser | 230 (4 BBL) | 1987 | 32-871171 | GM 305 V-8 |
| Mercury/Mercruiser | 260 (4 BBL) | 1987 | 32-871171 | GM 305 V-8 |
| Mercury/Mercruiser | 260 | 1987 | 32-871171 | GM 350 V-8 |
| Mercury/Mercruiser | 350 Mag (Ski) | 1991–1996 | 32-871171 | GM 350 V-8 |
| Mercury/Mercruiser | 350 Mag. Alpha | 1987–1995 | 32-871171 | GM 350 V-8 |
Technical Specs
- Product Type
- Molded Hose
- Installation Location
- Thermostat Cover to Starboard Manifold
- Connection IDs
- 1 in. (25.4 mm) and 13/16 in. (20.64 mm)
- Product Dimensions
- 37.0 x 22.0 x 4.0
- Weight
- 0.45 kg (16 ounces)
What’s in the Box
- 1 x Hose (Replaces OEM 32-871171)
Installation Notes
- Ensure the engine is completely cool before starting.
- Disconnect the boat's battery for safety.
- Place a catch pan under the hose to collect any draining coolant.
- Loosen the hose clamps at both the thermostat housing and the exhaust manifold.
- Gently twist and pull the old hose off the fittings. Clean any old sealant or residue from the fittings.
- Position the new hose, ensuring it matches the orientation of the original.
- Securely tighten new or existing clamps on both ends. Do not overtighten.
- Reconnect the battery.
- Refill the cooling system with the appropriate coolant.
- Start the engine and carefully inspect for any leaks around the new hose connections.
Troubleshooting & FAQ
How do I confirm this hose is the correct one for my Mercruiser engine?
The best way is to match your existing part number to one of the direct replacement numbers listed (Mercury 32-871171, Mallory 9-44059, Sierra 18-70932). You can also verify your engine model and year against our compatibility table. Visually compare the shape and connection sizes of your old hose with our product images and specifications.
What are the signs that my engine hose needs replacing?
Look for visible cracks, splits, or swelling. A spongy or excessively hard feel can also indicate the rubber has degraded. Coolant leaks or drips from the hose connections are a clear sign that replacement is needed immediately.
How often should marine engine hoses be replaced?
As a general preventative maintenance guideline, marine coolant hoses should be inspected annually and replaced every 3-5 years, even if they show no visible signs of damage. Harsh marine environments can cause rubber to degrade from the inside out.
Is this hose different from the original Quicksilver/Mercury part?
This is an aftermarket part designed to function identically to the OEM version. It is made from high-grade, salt and heat-resistant rubber, mirroring the fit, form, and function of the original 32-871171 hose, but at a more competitive price point.
Are clamps included with this hose?
This listing is for the molded hose only. Clamps are not included and must be purchased separately. We recommend using high-quality stainless steel marine-grade clamps for a secure, corrosion-resistant installation.
Can this hose be used for anything other than the thermostat-to-manifold connection?
No, this is a pre-molded hose specifically shaped for the connection between the thermostat housing and the starboard exhaust manifold on the listed Mercruiser engines. It should not be cut, modified, or used for any other application.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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